模型参考自适应类永磁同步电机无传感器位置估算参考资料：
<Analysis of an adaptive observer for sensorless control of interior PMSM>
<Comparison of MRAS and Novel Simple Method for Position Estimation in PMSM Drives >
<Comparison of MRAS and novel simple method for position estimation in PMSM drives>
<Position and Speed Sensorless Control of PMSM Drives Based on Adaptive Observer>
等
